{
 "cells": [
  {
   "cell_type": "markdown",
   "id": "e8f2f4b3",
   "metadata": {},
   "source": [
    "-----\n",
    "* 记录人（学习人）：林梦诗\n",
    "* 时间：2021-11-29\n",
    "* week 14\n",
    "* 学习线上资源：[python官方文档](https://python.rog/doc)\n",
    "* 博客--函数：[博客--函数](https://www.cnblogs.com/xuzhichao/p/11570285.html)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "99711138",
   "metadata": {},
   "source": [
    "## 本周学习目标\n",
    "> 1. 函数的定义\n",
    "> 2. 函数的使用\n",
    "> 3. 函数的参数"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "582da40f",
   "metadata": {},
   "source": [
    "## 函数的定义\n",
    "* 定义一个函数的一般步骤"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "id": "0327252c",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 1 1 2 3 5 8 \n"
     ]
    }
   ],
   "source": [
    "a, b = 0, 1\n",
    "while a < 10:\n",
    "    print(a, end=' ') # 0 1 1 2...\n",
    "    a, b = b, a+b # a=1 a=1 b=2 a=2 b=3\n",
    "print()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "id": "bb429cc0",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 1 1 2 3 5 8 13 21 34 \n"
     ]
    }
   ],
   "source": [
    "a, b = 0, 1\n",
    "while a < 50:\n",
    "    print(a, end=' ') # 0 1 1 2...\n",
    "    a, b = b, a+b # a=1 a=1 b=2 a=2 b=3\n",
    "print()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "id": "185911eb",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 1 1 2 3 5 8 13 21 34 55 89 \n"
     ]
    }
   ],
   "source": [
    "a, b = 0, 1\n",
    "while a < 100:\n",
    "    print(a, end=' ') # 0 1 1 2...\n",
    "    a, b = b, a+b # a=1 a=1 b=2 a=2 b=3\n",
    "print()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "f20ca8d4",
   "metadata": {},
   "outputs": [],
   "source": [
    "# ...我想重复使用某一个功能（避免重复造轮子）\n",
    "# ...使用的人可以不懂代码，只要会调用函数即可 function_name()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "472a9bc8",
   "metadata": {},
   "source": [
    "> 1. 定义函数的一般方法：\n",
    "```\n",
    "def function_name():  # 1.function_name 遵循变量定义的规则 区别数学函数==>f(x) python函数可以自定义名称\n",
    "    \"\"\"函数的注释\"\"\" # 2.函数的注释可以和使用者交流\n",
    "    函数体 # 3.函数体要和定义函数保持一定的tab缩进\n",
    "```"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "id": "852d6c23",
   "metadata": {},
   "outputs": [],
   "source": [
    "def fib(n): # write Fibonacci series up to n\n",
    "    \"\"\"Print a Fibonacci series up to n.\"\"\"\n",
    "    a, b = 0, 1\n",
    "    while a < n:\n",
    "        print(a, end=' ') # 0 1 1 2...\n",
    "        a, b = b, a+b # a=1 a=1 b=2 a=2 b=3\n",
    "    print()"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "52c30e57",
   "metadata": {},
   "source": [
    "## 2.函数的使用"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "id": "8f514851",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 1 1 2 3 5 8 \n"
     ]
    }
   ],
   "source": [
    "fib(10)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 13,
   "id": "d7c70c1f",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 1 1 2 3 5 8 13 21 34 \n"
     ]
    }
   ],
   "source": [
    "fib(50)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "id": "0ca91f40",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "0 1 1 2 3 5 8 13 21 34 55 89 \n"
     ]
    }
   ],
   "source": [
    "fib(100)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 60,
   "id": "5c66471e",
   "metadata": {},
   "outputs": [],
   "source": [
    "# 1.写一个函数 实现hello world\n",
    "# 2.写一个函数 实现hello username"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 16,
   "id": "0ca0bde2",
   "metadata": {},
   "outputs": [],
   "source": [
    "def hello():\n",
    "    \"\"\"打印你好，世界\"\"\"\n",
    "    print(\"hello,world!\")\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 17,
   "id": "f60c5717",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hello,world!\n"
     ]
    }
   ],
   "source": [
    "hello()"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 25,
   "id": "d1af537b",
   "metadata": {},
   "outputs": [],
   "source": [
    "def hello_user(username):\n",
    "    \"\"\"打印你好，xxx\"\"\"\n",
    "    print(\"hello,\"+ username.title()+\"\")\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 26,
   "id": "03f8fda2",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hello,Jackson\n"
     ]
    }
   ],
   "source": [
    "hello_user(\"Jackson\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "3bb4c577",
   "metadata": {},
   "source": [
    "* 思考：函数是否必须有参数？\n",
    "* 注意：\n",
    "> 1. 在第一行定义函数中，不需要任何信息就能完成工作，因此括号是空的（）即便如此，括号必不可少\n",
    "> 2. 要调用函数，可以依次指定函数名以及括号括起的必要信息，在第五行代码中，因为此函数hello()括号中不需要任何信息，只需要输入hello()即可。和预期效果一样，打印hello,world!"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "de3c8f8d",
   "metadata": {},
   "source": [
    "## 3.函数的参数\n",
    "> 1.形式参数\n",
    ">> 1. 定义函数时，写在function_name括号里面的参数\n",
    ">> 2. 在定义函数时，形式参数不占用空间\n",
    "\n",
    "> 2. 实际参数\n",
    ">> 1. 调用函数时，写在function_name括号里面的参数\n",
    ">> 2. 在使用函数时，形式参数被分配空间，变为实际参数"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 33,
   "id": "c6ac9b00",
   "metadata": {},
   "outputs": [],
   "source": [
    "def describe_pet(animal_type,pet_name):  # animal_type,pet_name是形式参数\n",
    "    \"\"\"显示宠物信息\"\"\"\n",
    "    print(\"\\nI have a\" + animal_type + \".\")\n",
    "    print(\"My \" + animal_type + \"'s name is \"+pet_name.title() + \".\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 34,
   "id": "af3f4647",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "I have adog.\n",
      "My dog's name is .\n"
     ]
    }
   ],
   "source": [
    "describe_pet(\"dog\",\"\")  # \"dog\",\"\"实际参数 实参"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 35,
   "id": "d901e2de",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "I have a .\n",
      "My  's name is Dog.\n"
     ]
    }
   ],
   "source": [
    "describe_pet(\" \",\"dog\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "0464a98f",
   "metadata": {},
   "source": [
    "* 当函数具有多个参数时\n",
    "> 1. 位置参数\n",
    ">> 1. 形式参数有先后顺序，函数调用过程中应考虑参数的先后顺序，避免出现顺序错误的笑话\n",
    ">> 2. 调用函数过程中要考虑形式参数的个数\n",
    "> 2. [关键字参数](Keyword Arguments)\n",
    ">> 1. 调用函数时，通过赋值的方式传递给形参变量数据\n",
    ">> 2. 关键字参数不考虑先后顺序，因为是指定变量赋值\n",
    "> 3. [默认参数](Default Argument Values)\n",
    ">> 1. 在形式参数中，提前预先设置一个用户可能使用的参数值\n",
    ">> 2. 用户在使用/调用函数时，可以省略不给默认参数赋值\n",
    ">> 3. 用户给默认参数赋值时，将替换默认参数的值"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 36,
   "id": "f19e5f06",
   "metadata": {},
   "outputs": [],
   "source": [
    "def describe_pet(animal_type,pet_name):  # animal_type,pet_name是形式参数\n",
    "    \"\"\"显示宠物信息\"\"\"\n",
    "    print(\"\\nI have a\" + animal_type + \".\")\n",
    "    print(\"My \" + animal_type + \"'s name is \"+pet_name.title() + \".\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 37,
   "id": "c7e2a542",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "I have adog.\n",
      "My dog's name is .\n"
     ]
    }
   ],
   "source": [
    "# 在使用describe_pet()函数时，需要考虑参数的位置，从而进行参数数据的输入（实参的调用）\n",
    "describe_pet(\"dog\",\"\") # 要根据 形式参数的位置先后顺序 先写animal_type,再写pet_name"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 38,
   "id": "b5aa5022",
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "describe_pet() takes 2 positional arguments but 4 were given",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-38-272cee921369>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mdescribe_pet\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;34m\"dog\"\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;34m\"cat\"\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;34m\" \"\u001b[0m\u001b[1;33m,\u001b[0m\u001b[1;34m\" \"\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m: describe_pet() takes 2 positional arguments but 4 were given"
     ]
    }
   ],
   "source": [
    "describe_pet(\"dog\",\"cat\",\" \",\" \")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 39,
   "id": "9e2b4720",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "I have adog.\n",
      "My dog's name is  .\n"
     ]
    }
   ],
   "source": [
    "# 关键字参数\n",
    "describe_pet(pet_name=\" \",animal_type=\"dog\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 67,
   "id": "de980e21",
   "metadata": {},
   "outputs": [],
   "source": [
    "# 默认参数\n",
    "def describe_pet(pet_name,animal_type=\"dog\"): # animal_type,pet_name 是形式参数 形参\n",
    "    \"\"\"\n",
    "    显示宠物信息\n",
    "    通过打印的方式显示宠物类型和宠物名称\n",
    "    参数信息：\n",
    "    pet_name:是一个字符串，宠物名称\n",
    "    animal_type:是一个字符串,宠物类型\n",
    "    \"\"\"\n",
    "    print(\"\\nI have a \" + animal_type + \".\")\n",
    "    print(\"My \" + animal_type + \"'s name is \"+pet_name.title() + \".\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 54,
   "id": "8d916cdd",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "I have a dog.\n",
      "My dog's name is  .\n"
     ]
    }
   ],
   "source": [
    "describe_pet(\" \")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 43,
   "id": "d80d76c1",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "\n",
      "I have a .\n",
      "My  's name is Cat.\n"
     ]
    }
   ],
   "source": [
    "describe_pet(\" \",\"cat\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 50,
   "id": "0193d242",
   "metadata": {
    "scrolled": true
   },
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on function describe_pet in module __main__:\n",
      "\n",
      "describe_pet(animal_type, pet_name)\n",
      "    显示宠物信息\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(describe_pet)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 49,
   "id": "2ca3b88f",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "hello\n",
      "hello\n"
     ]
    }
   ],
   "source": [
    "print(\"hello\",'\\n',\"hello\",sep='')\n",
    "# print(\"hello\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 45,
   "id": "0a87b3a4",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Help on built-in function print in module builtins:\n",
      "\n",
      "print(...)\n",
      "    print(value, ..., sep=' ', end='\\n', file=sys.stdout, flush=False)\n",
      "    \n",
      "    Prints the values to a stream, or to sys.stdout by default.\n",
      "    Optional keyword arguments:\n",
      "    file:  a file-like object (stream); defaults to the current sys.stdout.\n",
      "    sep:   string inserted between values, default a space.\n",
      "    end:   string appended after the last value, default a newline.\n",
      "    flush: whether to forcibly flush the stream.\n",
      "\n"
     ]
    }
   ],
   "source": [
    "help(print)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "e7155f51",
   "metadata": {},
   "source": [
    "---------\n",
    "参数使用过程中的思考与问题：\n",
    "> 1. 思考：关键字参数（调用函数） 和 位置参数（调用函数） 是否可以一起使用？(可以)\n",
    ">> 1. positional argument follows keyword argument(位置参数<font style=\"color:red\">均</font>要放在关键字参数前面)\n",
    ">> 2. test1() got multiple values for argument 'x'(映射，不能出现multiple values（多重值）)\n",
    "> 2. 定义函数：默认参数（定义函数）和非默认参数（定义函数）的先后关系\n",
    ">> 1. non-default argument follows default argument(非默认参数<font style=\"color:red\">均</font>要放在默认参数前面)\n",
    "---------\n",
    "* 以下为测试代码：\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 55,
   "id": "6d3b7a0b",
   "metadata": {},
   "outputs": [],
   "source": [
    "# 案例1：\n",
    "def test1(x,y,z):\n",
    "    \"\"\"打印x，y，z的值\"\"\"\n",
    "    print(x)\n",
    "    print(y)\n",
    "    print(z)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 57,
   "id": "4e6df333",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "positional argument follows keyword argument (<ipython-input-57-fd583303ea9b>, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-57-fd583303ea9b>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    test1(x=2,3,z=4)\u001b[0m\n\u001b[1;37m              ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m positional argument follows keyword argument\n"
     ]
    }
   ],
   "source": [
    "test1(x=2,3,z=4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 58,
   "id": "a1905400",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2\n",
      "3\n",
      "4\n"
     ]
    }
   ],
   "source": [
    "test1(2,y=3,z=4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 59,
   "id": "83e5b9b0",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "positional argument follows keyword argument (<ipython-input-59-32b91fe9ca8b>, line 1)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-59-32b91fe9ca8b>\"\u001b[1;36m, line \u001b[1;32m1\u001b[0m\n\u001b[1;33m    test1(2,y=3,4)\u001b[0m\n\u001b[1;37m                ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m positional argument follows keyword argument\n"
     ]
    }
   ],
   "source": [
    "test1(2,y=3,4)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 61,
   "id": "420415de",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "2\n",
      "3\n",
      "4\n"
     ]
    }
   ],
   "source": [
    "test1(2,z=4,y=3)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 62,
   "id": "aac9eb8b",
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "test1() got multiple values for argument 'x'",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-62-abf767fdec53>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mtest1\u001b[0m\u001b[1;33m(\u001b[0m\u001b[1;36m2\u001b[0m\u001b[1;33m,\u001b[0m\u001b[0mx\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m3\u001b[0m\u001b[1;33m,\u001b[0m\u001b[0my\u001b[0m\u001b[1;33m=\u001b[0m\u001b[1;36m1\u001b[0m\u001b[1;33m)\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m: test1() got multiple values for argument 'x'"
     ]
    }
   ],
   "source": [
    "test1(2,x=3,y=1)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 65,
   "id": "ec07ed31",
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "non-default argument follows default argument (<ipython-input-65-7d98dee2763a>, line 2)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-65-7d98dee2763a>\"\u001b[1;36m, line \u001b[1;32m2\u001b[0m\n\u001b[1;33m    def test1(x,y=3,z):\u001b[0m\n\u001b[1;37m              ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m non-default argument follows default argument\n"
     ]
    }
   ],
   "source": [
    "# 案例2：\n",
    "def test1(x,y=3,z):\n",
    "    \"\"\"打印x，y，z的值\"\"\"\n",
    "    print(x)\n",
    "    print(y)\n",
    "    print(z)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 66,
   "id": "d4852aa8",
   "metadata": {},
   "outputs": [],
   "source": [
    "# 案例2：\n",
    "def test1(x,z,y=3):\n",
    "    \"\"\"打印x，y，z的值\"\"\"\n",
    "    print(x)\n",
    "    print(y)\n",
    "    print(z)"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "8e304b8d",
   "metadata": {},
   "source": [
    "## 4.课本练习实践\n",
    "> 1. 总结函数优势：\n",
    ">> 1. 通过将函数存储在独立的文件中，可隐藏程序代码的细节，将重点放在程序的高层逻辑上；\n",
    ">> 2. 可以让不同的程序中重用函数；\n",
    ">> 3. 可与其他程序员共享这些文件而不是整个程序；\n",
    ">> 4. 知道如何导入函数能让你使用其他程序员编写的函数库。\n",
    "\n",
    "> 2. 预习课本第四章 函数与模块\n",
    ">> 1. 完成课本元音字母实践\n",
    ">> 2. 浏览模块，创建模块和调用模块，了解PEP 8 python国际代码标准"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 70,
   "id": "b16e9309",
   "metadata": {},
   "outputs": [],
   "source": [
    "def search4vowels(word):\n",
    "    \"\"\"判断输入文本出现的元音字母有哪些\"\"\"\n",
    "    vowels = set(\"aeiou\")\n",
    "    word = set(word)\n",
    "    print(vowels & word)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 71,
   "id": "7c0fd316",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'a', 'e'}\n"
     ]
    }
   ],
   "source": [
    "search4vowels(\"bfhdfbhjrea\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 72,
   "id": "5ab2b425",
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "{'a', 'i', 'e'}\n"
     ]
    }
   ],
   "source": [
    "search4vowels(\"bfhdfbhjreai\")"
   ]
  },
  {
   "cell_type": "markdown",
   "id": "1b4295cf",
   "metadata": {},
   "source": [
    "## 下周预告\n",
    "> 1. 函数返回值\n",
    "> 2. 模块介绍"
   ]
  }
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